Tweco 400 Ultra-Cut XT Plasma Cutting System - Manual (Page 106)

ULTRA-CUT 100 XT/200 XT/300 XT/400 XT
4-28 OPERATION Manual 0-5297
Group 7 - Pilot Proportional Valve (V3)
7-1 Valve open Check for open connection; Replace valve.
7-2 DPC inlet Supply pressure
low
Raise plasma inlet pressure; check for DMC valve not open; restriction in gas supply/hoses.
7-3 Outlet pressure too low Valve full open but pressure still too low. Leak in plasma hose to torch; defective control valve;
defective pressure sensor (PS6); DPC Control PCB
7-4 Outlet pressure low Tracking error. Leak in plasma hose to torch; defective control valve; defective pressure sensor
(PS6); DPC Control PCB
7-5 Outlet pressure Too high Valve at minimum setting but pressure still too high. Restriction in plasma hose, torch, DPC mani-
fold; defective control valve; defective pressure sensor (PS6); DPC Control PCB
7-6 Outlet pressure high Tracking error. Restriction in plasma hose, torch, DPC manifold; defective control valve; defective
pressure sensor (PS6); DPC Control PCB
Group 8 - Shield Gas Proportional Valve (V1)
8-1 Valve open Check for open connection; Replace valve.
8-2 DPC inlet Supply pressure
low
Raise plasma inlet pressure; check for DMC valve not open; restriction in gas supply/hoses.
8-3 Outlet pressure too low Valve full open but pressure still too low. Leak in plasma hose to torch; defective control valve;
defective pressure sensor (PS5); DPC Control PCB
8-4 Outlet pressure low Tracking error. Leak in plasma hose to torch; defective control valve; defective pressure sensor
(PS5); DPC Control PCB
8-5 Outlet pressure Too high Valve at minimum setting but pressure still too high. Restriction in plasma hose, torch, DPC mani-
fold; defective control valve; defective pressure sensor (PS5); DPC Control PCB
8-6 Outlet pressure high Tracking error. Restriction in plasma hose, torch, DPC manifold; defective control valve; defective
pressure sensor (PS5); DPC Control PCB
Group 9 - Shield H2O Proportional Valve (V2)
9-1 Valve open Check for open connection; Replace valve.
9-2 DPC inlet Supply pressure
low
Raise plasma inlet pressure; check for DMC valve not open; restriction in gas supply/hoses.
9-3 Outlet flow too low Valve full on but pressure still too low. Leak in shield hose to torch; Defective control valve (V2);
Defective pressure sensor (PS5) or flow sensor (FS-1) if equiped; DPC Control PCB
9-4 Outlet flow low Tracking error, outlet pressure too low. Leak in shield hose to torc; Defective control valve (V2).
Defective pressure sensor (PS5) or flow sensor (FS-1) if equiped; DPC Control PCB
9-5 Outlet flow Too high Valve set to minimum but valve outlet pressure still too high. Mineral build up or other restriction in
control valve (V2), DPC manifold, shield hose or torch; Defective control valve (V2)/ Defective pres-
sure sensor (PS5) or flow sensor (FS-1) if equiped; DPC Control PCB
9-6 Outlet flow high Tracking error, outlet pressure too high. Mineral build up or other restriction in control valve (V2),
DPC manufold, shield hose or torch; Defective control valve (V2); Defective pressure sensor (PS5)
or flow sensor (FS-1) if equiped; DPC Control PCB